Google AdSense Expandable Ads... No More?

I was very excited to read that Google AdSense was launching Expandable Ads - essentially growing rich media units that are more interactive and likely draw greater CPMs.
I am excited because it is an opportunity to expand the reach of richer ad units which are making waves in video (see VideoEgg, Tremor Media, etc) and in widgets (Widgetbox). Venturebeat had this screenshot:

But strangely, Google has since removed their post about the product that has been linked to from various sites... was this intended as a private beta launch? Or did it leak? Not sure - but hopefully it will make it way onto this blog!

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